Damage caused by crows was examined on the Erimo Beef Cattle Farm, Hokkaido, in the past ten years. The heat-mount detector was broken by pecking in 44% of the cows equipped with it. When the crow pecked the hoof and tongue of afetus at the time of parturition, the fetus suffered from rctarded growth. Of 77 fbtuse specked, nine succumbed eventually.
When 13 cows showed prolapse of the vagina, crows pecked the vaginal wall and 10 cows were finally condemned on account of the vaginal injury.